3 photos(Photo: Reuters/Mario Anzuoni)Singer Justin Bieber arrives at the 2011 MTV Video Music Awards in Los Angeles, August 28, 2011.

Bieber fans have untied today to celebrate the 18th birthday of pop singer sensation, Justin Bieber. As fans looked forward to the years to come, they also reminisced about the little boy they all fell in love with.

Bieber became one of the world's first YouTube sensations. Scooter Braun was the first to discover the pop idol, on a YouTube video in 2008. His first single, "One Time" was released in 2009 and became a part of his later album "My World" which has been certified platinum. Bieber also became the first artist to have seven songs from a debut album chart on the Billboard Hot 100.

Twitter users had nothing but positive things to say about Bieber. "Where did the time go? Im gonna miss the little guy:/ But I'm looking forward 2 seeing the man he's going 2 become! Justin is OFFICIALLY 18," Twitter users posted on Twitter nearly 5,000 times.

"18 years ago, a role model, an inspiration, a friend, a star, a boy who changed our lives was born. Justin Bieber," Breezy wrote.

"Justin is OFFICIALLY 18. 3 years ago we were all introduced to you. You inspired us And you always will," wrote Jelena Bieber.

"When he was 16, he dreamed big. When he was 17, he taught us to never say never. Justin is OFFICIALLY 18 now & he's ready to make us believe," said LoveYouBieber.

Bieber also took to Twitter to thank his fans for the special wishes and talk about his day. "Love all u guys too. thanks for the bday love," he tweeted. "Birthday started off great! my boys are in town. let the fun begin." For his birthday Bieber received his dream car, a Fisker Karma.